Double-amplitude four-cable-plane multi-tower cable-stayed bridge with annular row support stump flowerpot-shaped bracket

Abstract

The double-amplitude four-cable-plane multi-tower cable-stayed bridge with the annular row support stump flowerpot-shaped bracket has the advantages of being good in structural rigidity, attractive inmodeling, convenient to construct, economical, reasonable and the like. A single-blade double-curved-surface thin-shell stump flowerpot-shaped bracket is arranged on a bridge foundation, an annular row support is arranged at the top of the stump flowerpot-shaped bracket to support a double-amplitude main beam bridge deck, the annular row support system can restrain relative rotation between a main beam and a cable bent tower, and the structural rigidity of the multi-tower cable-stayed bridge is improved. Unbonded prestressed steel strands are uniformly arranged in the variable cross-section concrete-filled steel tube hollow column type bridge tower column, prestressed steel bars are tensioned to extrude concrete, the compactness of concrete in a tube is improved, the problem of interfaceseparation of a large-diameter steel tube and a core concrete column body is solved, and the structural rigidity of the variable cross-section concrete-filled steel tube bridge tower column is improved. Simulated bark is adhered to the periphery of the variable cross-section prestressed concrete-filled steel tube bridge tower column, and the artificial leaf tower crown is arranged at the top of the variable cross-section prestressed concrete-filled steel tube bridge tower column, so that the landscape effect is improved.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a cable-stayed bridge structure, in particular to a double-width, four-cable plane, and multi-tower cable-stayed bridge with ring-row supports, tree stumps and flowerpot-shaped brackets. Background technique [0002] The double-width four-cable plane multi-tower cable-stayed bridge is a cable-stayed bridge with three or more single-column towers. With the advantages of small area and reasonable economic indicators, the double-width four-cable plane multi-tower cable-stayed bridge is well received by the bridge engineering community. [0003] In view of the mechanical characteristics of the double-width four-cable plane multi-tower cable-stayed bridge, the two sides of the middle tower of the double-width four-cable plane multi-tower cable-stayed bridge have neither auxiliary piers and transition piers nor end anchor cables, and there is no support for the main girder and cable towe...

AI Technical Summary

Problems solved by technology

[0005] Adopting the scheme of increasing the geometric dimensions of the cable tower structure and the main beam structure, that is, using a large-scale cable tower structure to increase the stiffness of the bridge tower and the main beam structure, will increase the cost of the bridge, which is very uneconomical; adopting the tower beam consolidation scheme will lead to temperature effects The increase of the force on the bridge tower under the action will increase the scale of the cable tower and the foundation; the use of side spans to set auxiliary piers and transition piers has some effect on three-tower cable-stayed bridges, and for multi-tower cable-stayed bridges with more than four spans, the other It cannot improve the force bearing of the intermediate bridge towers, nor can it reduce the problem of excessive live load displacement of the main girder of the intermediate span; adopting the scheme of setting auxiliary cables, and setting auxiliary cables between the cable towers is an effective method to improve the stiffness and stability of multi-tower cable-stayed bridges , however, affects the aesthetics of the bridge

[0006] The Jiashao Bridge is a Strait Bridge across the Hangzhou Bay. It adopts a double-width, four-cable plane, and six-tower cable-stayed bridge structure system. The Jiashao Bridge proposes that the cable towers be equipped with cantilevered X-shaped brackets, and the main girder is equipped with longitudinal double-row supports. The relative rotation degrees of freedom between the main girder and the cable tower are constrained to improve the stress of the multi-tower cable-stayed bridge. The beam consolidation system is basically the same, which can solve the problem of the vertical stiffness of the main girder of the multi-tower cable-stayed bridge with weak tower structure. However, the force of the cantilever X-shaped bracket is very complicated. The construction of the standard cantilever X-shaped bracket is very difficult, and the construction of the negative moment steel bar of the cantilever X-shaped bracket anchored to the tower column is very difficult

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